Toyota prius 3rd gen Skid Control ECU with Actuator Assembly (A58)

Toyota Prius 3 ^rd Generation (XW30)

Skid Control ECU with Actuator Assembly Wiring Guide: DIY Pinout Diagram

Last Updated:

What is:The Skid Control ECU with Actuator Assembly is a key component of a vehicle’s Anti-lock Braking System (ABS) and Vehicle Stability Control (VSC) system. It integrates both the electronic control unit (ECU) and the hydraulic actuator into a single unit, enabling precise and rapid control of the braking system.

1. Introduction

The Toyota Prius 3rd generation Skid Control ECU with Actuator Assembly is an integrated unit combining the electronic control module and hydraulic brake actuator. It manages key systems such as ABS, VSC, TRC, EBD, and Brake Assist, while coordinating with the hybrid regenerative braking system. Using sensor data, it precisely regulates hydraulic pressure for stable braking and traction. Compactly mounted near the master cylinder, it ensures smooth, safe, and efficient braking under all driving conditions.

Skid Control ECU with Actuator Assembly – Most Common in (XW30)

❮ ❯

1. Sensors and Input Devices Components
   • Wheel Speed Sensors (ABS Sensors) – detect individual wheel speeds.
   • Yaw Rate and Acceleration Sensor – monitors vehicle rotation and lateral movement.
   • Steering Angle Sensor – measures steering wheel position and rate of turn.
   • Brake Pedal Stroke Sensor – detects pedal travel and pressure demand.
   • Master Cylinder Pressure Sensor – senses hydraulic pressure for brake control.
2. Hydraulic and Brake Components
   • Brake Master Cylinder (often built into the actuator assembly)
   • Brake Booster / Pump Motor – provides hydraulic pressure assistance.
   • Brake Lines and Hoses – carry brake fluid to each wheel cylinder/caliper.
   • Brake Calipers and Wheel Cylinders – apply braking force to wheels.
   • Brake Fluid Reservoir – stores brake fluid for the system.
3. Electrical and Control Components
   • Hybrid Vehicle Control ECU- coordinates regenerative and hydraulic braking.
   • Power Supply Relay and Fuses – provide stable current to the actuator motor and solenoids.
   • Stop Light Switch– signals brake pedal activation to the ECU.
   • CAN Communication Network – connects the skid control ECU with other vehicle systems.

2. Skid Control ECU with Actuator Assembly Wiring Diagram & Pinout

A. Connector Location

• Skid Control ECU with Actuator Assembly Position: Front of the vehicle, slightly towards the driver’s side, above or attached to the brake pedal firewall area.
• Connector Type:
  • A58 (42 pin) gray housing

B. Wiring Table

Skid Control ECU with Actuator Assembly (A58)

A58 TERMINALS OF Skid Control ECU with Actuator Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
1	MRI1	(B) Black	➔ 1 2 ➤ (BAT) 30A Main Fuse [ABS MTR 1]
2	MTI2	(R) Red	➔ 1 2 ➤ (BAT) 30A Main Fuse [ABS MTR 2]
3	STPO	(Y) Yellow	➔ A28 9 (ACC) [Stop Light Control Relay Assembly]
4	TS	(B) Black	➔ AL2 7 ➳ L61 12 (TS) [DLC3]
5	FR-	(L) Blue	➔ A34 1 [Font Speed Sennsor RH]
6	STP2	(BE) Beige	➔ A51 3 ⬌ A50 3 ➔ A28 1 (OUT) [Stop Light Control Relay Assembly] ➔ A51 3 ⬌ A51 4 ➔ AS1 8 ➳ S18 2 (B) [Rear Combination Light Assembly RH] ➔ A51 3 ⬌ A50 4 ➔ AR1 5 ➳ R29 8 ⬌ R28 12 ➔ R17 2 (B) [Rear Combination Light Assembly LH] ➔ A51 3 ⬌ A50 4 ➔ AR1 5 ➳ R29 8 ⬌ R29 7 ➳ VR1 15 ➔ V14 1 (STP+) [Noise Filter (Stop Light)] ➔ A51 3 ⬌ A50 4 ➔ AR1 5 ➳ R29 8 ⬌ R29 7 ➳ VR1 15 ➳ dV1 2 ➔ d1 2 (B) [Center Stop Light Assembly]
7	RL-	(B) Black	➔ AR1 4 ➳ ▬ ➳ zR1 2 ➔ z1 1 [Rear Speed Sensor LH]
8	_	_	_
9	RR-	(B) Black	➔ AS1 9 ➳ ▬ ➳ zS1 2 ➔ z2 1 [Rear Speed Sensor RH]
10	HZRI	(SB) Sky Blue	➔ AL2 16 ➳ 3B 4 ⇔ 3A 14 ➔ L78 8 (F) [Integration Control and Pannel Assembly]
11	SP1	(V) Violet	➔ AL2 18 ➳ L27 8 (SI) [Combination Meter Assembly]
12	IG2	(BE) Beige	➔ 2C 14 ➤ (IG) 10A Blade Fuse [IGN]
13	BZ	(BR) Brown	➔ AL2 13 ➳ L46 1 (BZ) [Skid Control Buzzer Assembly]
14	BI	(W) White	➔ 1 2 ➤ (IG) 7.5A Blade Fuse [ABS MAIN NO.2]
15	BS	(B) Black	➔ 1 2 ➤ (BAT) 20A Blde Fuse [ABS MAIN NO.1]
16	IG1	(B) Black	➔ A54 3 ⬌ A54 2 ➔ 2C 26 ➤ (IG) 10A Blde Fuse [ECU-IG NO.2]
17	_	_	_
18	FR+	(P) Pink	➔ A34 2 [Font Speed Sensor RH]
19	CTY	(V) Violet	➔ AL1 7 ➳ 3A 78 ⇔ 3A 66 ➔ LR1 54 ➳ R6 1 [Front Door Courtesy Light Switch Assembly LH]
20	RL+	(W) White	➔ AR1 3 ➳ ▬ ➳ zR1 1 ➔ z1 2 [Rear Speed Sensor LH]
21	EXO	(BE) Beige	➔ A28 9 (ESSI) [Stop Light Control Relay Assembly]
22	RR+	(W) White	➔ AS1 10 ➳ ▬ ➳ zS1 1 ➔ z2 2 [Rear Speed Sensor RH]
23	GND6	(W-B) White/Black	➔ ✠ ➔ ▼ A1 (Ground Point)
24	GND5	(W-B) White/Black	➔ ✠ ➔ ▼ A1 (Ground Point)
25	GND4	(W-B) White/Black	➔ ✠ ➔ ▼ A1 (Ground Point)
26	GND3	(W-B) White/Black	➔ ✠ ➔ ▼ A1 (Ground Point)
27	GND2	(W-B) White/Black	➔ ✠ ➔ ▼ A1 (Ground Point)
28	GND	(W) White	➔ A56 9 ⬌ A56 8 ➔ ▼ A3 (Ground Point) ➔ A56 9 ⬌ A56 5 ➔ ✠ ⚋ (Shielded) ⚋ ➔ A56 9 ⬌ A56 6 ➔ ✠ ⚋ (Shielded) ⚋
29	MRO1	(B) Black	➔ A17 1 (BM1) [ Brake Booster Pump Assembly]
30	MRO2	(B) Black	➔ A18 2 (BM2) [ Brake Booster Pump Assembly]
31	FL+	(R) Red	➔ A15 2 [ Font Speed Sensor LH ]
32	FL-	(G) Green	➔ A15 1 [ Font Speed Sensor LH ]
33	STP	(L) Blue	➔ A51 8 ⬌ A50 10 ➔ A28 5 (STP) [Stop Light Control Relay] ➔ A51 8 ⬌ A50 11 ➔ A26 1 [Stop Light Switch]
34	CAN2L	(V) Violet	➔ AL3 8 ➳ L101 3
35	CA2H	(P) Pink	➔ AL3 9 ➳ L101 14
36	LBL	(P) Pink	➔ A32 1 (+) [Brake Fluid Level Warning Switch]
37	CA1H	(LG) Light Green	➔ AL3 3 ➳ L94 10
38	CA1L	(L) Blue	➔ AL3 2 ➳ L94 21
39	VCSK	(B) Black	➔ A30 3 (VCSK) [Brake Pedal Stoke Sensor Assembly]
40	SKS2	(G) Green	➔ A30 2 (SKS2) [Brake Pedal Stoke Sensor Assembly]
41	SKG	(W) White	➔ A30 1 (SKG) [Brake Pedal Stoke Sensor Assembly]
42	SKS	(R) Red	➔ A30 4 (SKS1) [Brake Pedal Stoke Sensor Assembly]

Go back